Well fast one will blow fast and a slow one will blow slow, as you might have guessed ...

When you have a fast one it will blow pretty quickly on a momentary overload, a bit of a nervous thing which can be useful. But when used in a power supply it will probably blow the very instant you turn the device on as some extra current is needed to power the thing up.

That current will settle to the normal value after a short while and the slow blow fuse will wait for that and then if the current is still too high it will blow, but not on the rush-in current.

Now you could take a fast one with a higher current rating but then when there is an overload condition it might not blow anymore._________________Jan

can you please confirm, the solution you described here
will also work with the Nord Lead 3 Keyboard version?
So I need a 250V - 125mA slow blow fuse and switch
the power supply switch to 230V. Do I need to open
the unit for this?

I am waiting for my NL3 from the US which will arrive
in the next days.

You'll have to open the synth indeed. Couple of screws on the back, two on the sides (there are four, two on each side, but the ones with the nylon washers stay in, the other two go out) and one at the bottom, something like that anyway.

There should be a plate at the back of the synth indicating what the current fuse value is in mA, divide that value by two for a 230V configuration. Probably it says 250 mA and then you have to buy a 125 mA one. (those seem to be the values for all Clavia gear ) .

And slow blow or (T type) is correct, this will also be indicated on the back of the synth BTW.

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